From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Performance graph comparing carburation options for a 3 1/2 Litre Bentley engine.
| Identifier | ExFiles\Box 93\2\ scan0013 | |
| Date | 7th May 1934 | |
| CARBURATION 3 1/2 LITRE BENTLEY UN TB7 COMP. RATIO 6.5:1 (E.B.6.S) PISTONS E.B. 7299 STD. 20/25 CAMSHAFT IN. VALVE: 1.40 DIA Ex. " 1.30 DIA ① 2. 1.375. S.U. CARBS ON 1.500 INDN. PIPE ② 2. 1.250 S.U. CARBS ON 1.375 INDN. PIPE B.H.P B.M.E.P INDN PIPE DEPN. "Hg R.P.M. TDC BDC 4.5° 54.6° 33.6° E59699(1.05") (TAPPETS .020) | ||